a physical sign recognizing that an awkward moment has occured, or warning that a supremely awkward moment may occur if you don't watch out. an awkward tent is made by raising both arms above the head, elbows bent and fingertips touching, forming a "tent" above you. once the awkward tent is made, it has been acknowledged that an awkward moment has indeed occured, and everyone in the room can get on with whatever they were doing.

"Guys, is it weird to get festering red hives. . . down there?" asked Polly, loudly and to the entire dinner table.
Everyone put up their awkward tents.